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Formula: Mg3(PO4)2
Phosphate, sarcopside group,
paramorph of
farringtonite, forms a complete solid solution with
sarcopside
Crystal System: Monoclinic
Specific gravity: 3.34 calculated
Colour: Colourless
Environments
Metamorphic environments
Meteorites
Localities
At the type locality, Brattnevet Peninsula, Larsemann Hills, Prydz Bay, Ingrid Christensen Coast, Princess
Elizabeth Land, Eastern Antarctica, Antarctica, chopinite is found as four inclusions isolated in a
fluorapatite segregation in a
quartz mass in
granulite facies
paragneiss. Grains are mostly anhedral and up to 0.6 mm in size.
Minerals present in the chopinite-bearing specimen include
wagnerite, xenotime-(Y),
stornesite-(Y), phosphorous-bearing
K-feldspar and
plagioclase, titanium-rich
biotite, sillimanite,
orthopyroxene, sapphirine,
hercynite and corundum
(EJM 19.229-245).
At the Graves Nunataks 95209 meteorite, Graves Nunataks meteorites, Wisconsin Range, Transantarctic Mountains,
Eastern Antarctica, Antarctica, chopinite was found in the transitional
acapulcoite meteorite affected by shock metamorphism.
Associated minerals include sarcopside,
chladniite -
johnsomervilleite and
farringtonite
(HOM).
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